Performance terms
Every millisecond matters — here is how to win them back
Slow software costs money, loses users, and erodes trust. Performance engineering covers profiling, caching strategies, database query optimisation, network latency, memory management, and the architectural patterns that keep systems fast under real-world load. Most performance problems are invisible until they are not — these terms help you find and fix them before your users do.
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Most referenced — Performance
Cache Stampede / Thundering Herd 1PHP Session Performance & Locking 1N+1 Problem in Doctrine & Eloquent 1Eager Loading 1HTTP/2 & HTTP/3 1Brotli vs gzip Compression 1Excessive File I/O 1Read Replicas & Database Scaling 1
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Terms pinged66 / 66
Distinct agents10
Memory Pressure Detection PHP 7.0+
Proactively identifying when a PHP process approaches its memory limit so corrective action can be taken before a fatal error.
1d ago
performance intermediate
Core Web Vitals
Google's three field-measured performance metrics — LCP (loading), INP (interactivity), CLS (visual stability) — used as direct search ranking signals since 2021.
1mo ago
performance intermediate
Cumulative Layout Shift (CLS)
A Core Web Vital that measures unexpected visual movement of page elements during load — caused by images without dimensions, late-injected content, and font swaps. Target: under 0.1.
1mo ago
performance intermediate
Image Optimisation
Reducing image file size and delivery overhead through format choice (AVIF, WebP), compression, responsive sizing (srcset), lazy loading, and explicit dimensions — the single highest-impact performance lever for most websites.
1mo ago
performance intermediate
Largest Contentful Paint (LCP)
A Core Web Vital that measures when the largest above-fold content element (typically the hero image or main heading) becomes visible — target under 2.5 seconds. The most impactful page speed metric.
1mo ago
performance intermediate
Resource Hints (preconnect, prefetch, preload)
HTML link attributes that instruct the browser to take early action on resources — opening connections, fetching future pages, or loading critical assets before they are discovered in HTML parsing.
1mo ago
performance intermediate
Caching Strategies PHP 7.0+
Patterns for when and how to store and invalidate cached data — cache-aside, write-through, write-behind, and read-through each make different trade-offs between consistency, complexity, and performance.
2mo ago
performance intermediate
Redis PHP 7.0+
An in-memory key-value data store used in PHP applications for caching, session storage, queues, rate limiting, and pub/sub — providing sub-millisecond data access compared to database queries.
2mo ago
performance beginner
Brotli vs gzip Compression PHP 5.0+
Brotli (br) compresses 15-25% better than gzip for text content — use Brotli for supported browsers (all modern ones), gzip as fallback, both configured at the server level not PHP.
2mo ago
performance intermediate
Cache Warming Strategies PHP 5.0+
Pre-populating a cache before traffic arrives — preventing the cold-start thundering herd where every request misses a cold cache simultaneously after a deploy.
2mo ago
performance intermediate
HTTP/3 & QUIC
HTTP/3 runs over QUIC (UDP-based) instead of TCP — eliminating head-of-line blocking, reducing connection setup time, and improving performance on lossy networks.
2mo ago
performance advanced
Image Optimisation PHP 7.0+
Serving images in modern formats (WebP, AVIF), at the correct size, with appropriate compression — typically the single biggest performance win for image-heavy pages.
2mo ago
performance intermediate
PHP Async Frameworks PHP 8.1+
ReactPHP and Amp provide event-loop async I/O — enabling concurrent HTTP requests without blocking.
2mo ago
performance advanced
Resource Prefetching HTML5
dns-prefetch, preconnect, preload, and prefetch hints — fetching critical resources early to reduce perceived load time.
2mo ago
performance intermediate
RoadRunner — Persistent PHP Worker PHP 8.0+
Go-based server keeping PHP workers alive between requests — eliminating per-request bootstrap cost.
2mo ago
performance advanced
Swoole / OpenSwoole PHP 7.4+
PHP extension with coroutines, async I/O, and built-in HTTP server — handling thousands of concurrent connections in one process.
2mo ago
performance advanced
Worker Pool Patterns PHP 5.0+
Fixed pool of pre-spawned workers for parallel tasks — avoiding per-task process spawn overhead.
2mo ago
performance advanced
APCu — In-Process User Cache PHP 5.4+ APCu stores PHP values in shared memory within the PHP-FPM pool — the fastest possible cache with no network hop overhead.
2mo ago
performance intermediate
Asset Versioning & Browser Cache Strategy Serving static assets with immutable long-lived cache headers plus content-hash filenames — maximising cache hits while guaranteeing instant cache-busting on change.
2mo ago
performance beginner
Async Processing / Job Queues PHP 5.0+ Deferring time-consuming work (emails, image processing, third-party API calls) to background workers via a queue, improving response times.
2mo ago
performance intermediate